scholarly journals Recent Advances of Nanoremediation Technologies for Soil and Groundwater Remediation: A Review

Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2186
Author(s):  
Motasem Y. D. Alazaiza ◽  
Ahmed Albahnasawi ◽  
Gomaa A. M. Ali ◽  
Mohammed J. K. Bashir ◽  
Nadim K. Copty ◽  
...  
Keyword(s):  
Soil Remediation ◽  
Environmental Remediation ◽  
Metal Ion ◽  
Groundwater Remediation ◽  
High Efficiency ◽  
High Reactivity ◽  
Green Technology ◽  
Efficient Technology ◽  
Environmental Cleanup ◽  
Metal Ion Adsorption

Nanotechnology has been widely used in many fields including in soil and groundwater remediation. Nanoremediation has emerged as an effective, rapid, and efficient technology for soil and groundwater contaminated with petroleum pollutants and heavy metals. This review provides an overview of the application of nanomaterials for environmental cleanup, such as soil and groundwater remediation. Four types of nanomaterials, namely nanoscale zero-valent iron (nZVI), carbon nanotubes (CNTs), and metallic and magnetic nanoparticles (MNPs), are presented and discussed. In addition, the potential environmental risks of the nanomaterial application in soil remediation are highlighted. Moreover, this review provides insight into the combination of nanoremediation with other remediation technologies. The study demonstrates that nZVI had been widely studied for high-efficiency environmental remediation due to its high reactivity and excellent contaminant immobilization capability. CNTs have received more attention for remediation of organic and inorganic contaminants because of their unique adsorption characteristics. Environmental remediations using metal and MNPs are also favorable due to their facile magnetic separation and unique metal-ion adsorption. The modified nZVI showed less toxicity towards soil bacteria than bare nZVI; thus, modifying or coating nZVI could reduce its ecotoxicity. The combination of nanoremediation with other remediation technology is shown to be a valuable soil remediation technique as the synergetic effects may increase the sustainability of the applied process towards green technology for soil remediation.

Hollow manganese phosphonate microspheres with hierarchical porosity for efficient adsorption and separation

Nanoscale ◽  
2014 ◽  
Vol 6 (12) ◽  
pp. 6627-6636 ◽  
Author(s):  
Yun-Pei Zhu ◽  
Ya-Lu Liu ◽  
Tie-Zhen Ren ◽  
Zhong-Yong Yuan
Keyword(s):  
Metal Ion ◽  
Protein Separation ◽  
High Efficiency ◽  
Hollow Microspheres ◽  
Ion Adsorption ◽  
Hierarchical Porosity ◽  
Metal Ion Adsorption ◽  
Hierarchical Porous ◽  
Template Free

Hollow microspheres of hierarchical porous manganese phosphonate were prepared template-free, exhibiting high efficiency for metal ion adsorption and protein separation.

scholarly journals Preparation, characterization and application of CS@PDA@Fe3O4 nanocomposite as a new magnetic nano-adsorber for the removal of metals and dyes in wastewater

RSC Advances ◽  
2021 ◽  
Vol 11 (38) ◽  
pp. 23679-23685
Author(s):  
Xingjing Zhang ◽  
Baohe Li ◽  
Xiaoqian Han ◽  
Nong Wang
Keyword(s):  
Heavy Metal ◽  
Metal Ion ◽  
Heavy Metal Ion ◽  
Ion Adsorption ◽  
Metal Ion Adsorption

Synthesis of CS@PDA@Fe3O4 nanocomposite and heavy metal ion adsorption.

scholarly journals Biodegradation and metabolic pathway of fenvalerate by Citrobacter freundii CD-9

AMB Express ◽  
2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Jie Tang ◽  
Dan Lei ◽  
Min Wu ◽  
Qiong Hu ◽  
Qing Zhang
Keyword(s):  
Environmental Pollution ◽  
Environmental Remediation ◽  
High Efficiency ◽  
Mass Spectrometry Analysis ◽  
Gas Chromatography Mass Spectrometry ◽  
Citrobacter Freundii ◽  
16S Rrna Sequence ◽  
Intracellular Enzyme ◽  
Pyrethroid Insecticides ◽  
Spectrometry Analysis

Abstract Fenvalerate is a pyrethroid insecticide with rapid action, strong targeting, broad spectrum, and high efficiency. However, continued use of fenvalerate has resulted in its widespread presence as a pollutant in surface streams and soils, causing serious environmental pollution. Pesticide residues in the soil are closely related to food safety, yet little is known regarding the kinetics and metabolic behaviors of fenvalerate. In this study, a fenvalerate-degrading microbial strain, CD-9, isolated from factory sludge, was identified as Citrobacter freundii based on morphological, physio-biochemical, and 16S rRNA sequence analysis. Response surface methodology analysis showed that the optimum conditions for fenvalerate degradation by CD-9 were pH 6.3, substrate concentration 77 mg/L, and inoculum amount 6% (v/v). Under these conditions, approximately 88% of fenvalerate present was degraded within 72 h of culture. Based on high-performance liquid chromatography and gas chromatography-mass spectrometry analysis, ten metabolites were confirmed after the degradation of fenvalerate by strain CD-9. Among them, o-phthalaldehyde is a new metabolite for fenvalerate degradation. Based on the identified metabolites, a possible degradation pathway of fenvalerate by C. freundii CD-9 was proposed. Furthermore, the enzyme localization method was used to study CD-9 bacteria and determine that its degrading enzyme is an intracellular enzyme. The degradation rate of fenvalerate by a crude enzyme solution for over 30 min was 73.87%. These results showed that strain CD-9 may be a suitable organism to eliminate environmental pollution by pyrethroid insecticides and provide a future reference for the preparation of microbial degradation agents and environmental remediation.

scholarly journals Metal Ion Implanted Compliant Electrodes in Dielectric Electroactive Polymer (EAP) Membranes

2008 ◽  
Vol 61 ◽  
pp. 18-25 ◽  
Author(s):  
Philippe Dubois ◽  
Samuel Rosset ◽  
Muhamed Niklaus ◽  
Massoud Dadras ◽  
Herbert Shea
Keyword(s):  
Metal Ion ◽  
High Efficiency ◽  
Relative Displacement ◽  
Electroactive Polymer ◽  
Metallic Films ◽  
Key Factors ◽  
Nano Composite ◽  
Transmission Electron ◽  
Macro Scale ◽  
Compliant Electrodes

One of the key factors to obtain large displacements and high efficiency with dielectric electroactive polymer (DEAPs) actuators is to have compliant electrodes. Attempts to scale DEAPs down to the mm or micrometer range have encountered major difficulties, mostly due to the challenge of micropatterning sufficiently compliant electrodes. Simply evaporating or sputtering thin metallic films on elastomer membranes produces DEAPs whose stiffness is dominated by the metallic film. Low energy metal ion implantation for fabricating compliant electrodes in DEAPs presents several advantages: a) it is clean to work with, b) it does not add thick passive layers, and c) it can be easily patterned. We use this technology to fabricate DEAPs micro-actuators whose relative displacement is the same as for macro-scale DEAPs. With transmission electron microscope (TEM) we observed the formation of metallic clusters within the elastomer (PDMS) matrix, forming a nano-composite. We focus our studies on relating the properties of this nano-composite to the implantation parameters. We identified the optimal implantation parameters for which an implanted electrode presents an exceptional combination of high electrical conductivity and low compliance.

scholarly journals Co3O4/TiO2 hetero-structure for methyl orange dye degradation

2018 ◽  
Vol 79 (5) ◽  
pp. 947-957 ◽  
Author(s):  
Mahabubur Chowdhury ◽  
Sarah Kapinga ◽  
Franscious Cummings ◽  
Veruscha Fester
Keyword(s):  
Catalytic Activity ◽  
Methyl Orange ◽  
Environmental Remediation ◽  
Metal Ion ◽  
Dye Degradation ◽  
Lattice Structure ◽  
Host Lattice ◽  
Commercial Application ◽  
Potential Candidate ◽  
Methyl Orange Degradation

Abstract Advanced oxidation processes based on sulphate radical generated by peroxymonosulphate (PMS) activation is a promising area for environmental remediation. One of the biggest drawbacks of heterogeneous PMS activation is catalyst instability and metal ion leaching. In this study, a simple organic binder mediated route was explored to substitute Ti4+ ions into the Co3O4 host lattice structure to create a Co-O-Ti bond to minimise cobalt leaching during methyl orange degradation. The catalyst was characterised by X-ray diffraction, and scanning and transmission electron microscopy. The as-prepared catalysts with Co3O4:TiO2 ratio of 70:30 exhibited minimal leaching (0.9 mg/L) compared to other ratios studied. However, the pristine Co3O4 exhibited highest catalytic activity (rate constant = 0.41 min−1) and leaching (26.7 mg/L) compared to composite material (70:30 Co3O4:TiO2). Interestingly, the morphology of the composite and leaching of Co2+ ions were found to be temperature dependent, as an optimum temperature ensured strong Co-O-Ti bond for prevention of Co2+ leaching. The classical quenching test was utilised to determine the presence and role of radical species on methyl orange degradation. The fabricated catalyst also exhibited good catalytic activity in degrading mixed dyes and good recyclability, making it a potential candidate for commercial application.

Why do zeolites induce an unprecedented electronic state on exchanged metal ions?

2017 ◽  
Vol 19 (36) ◽  
pp. 25105-25114 ◽  
Author(s):  
Akira Oda ◽  
Takahiro Ohkubo ◽  
Takashi Yumura ◽  
Hisayoshi Kobayashi ◽  
Yasushige Kuroda
Keyword(s):  
Metal Ions ◽  
Electronic State ◽  
Base Metal ◽  
Metal Ion ◽  
High Efficiency ◽  
Lewis Base ◽  
Mfi Zeolite ◽  
Adsorption Processes ◽  
Exact Position

Understanding the exact position and the detailed role of the Al array in zeolites is essential for elucidating the origin of unique properties and for designing zeolite materials with high efficiency in catalytic and adsorption processes. In this work, we advanced pivotal roles of Lewis base–metal ion bifunctionality caused by Al atoms arrayed circumferentially in the MFI-zeolite pores.

Impact of the degree of functionalization of graphene oxide on the electrochemical charge storage property and metal ion adsorption

RSC Advances ◽  
2014 ◽  
Vol 4 (107) ◽  
pp. 62737-62745 ◽  
Author(s):  
Mahesh M. Kadam ◽  
Omkar R. Lokare ◽  
Kota V. M. K. Kireeti ◽  
Vilas G. Gaikar ◽  
Neetu Jha
Keyword(s):  
Graphene Oxide ◽  
Metal Ion ◽  
Charge Storage ◽  
Ion Adsorption ◽  
Oxidizing Agent ◽  
Metal Ion Adsorption ◽  
Storage Property

The increase in oxygen functionalities on GO with increasing use of oxidizing agent results in (i) amplification of redox pseudocapacitive current and (ii) improves metal ion adsorption.

scholarly journals Cadmium Ion Biosorption by the Thermophilic Bacteria Geobacillus stearothermophilus and G. thermocatenulatus

2006 ◽  
Vol 72 (6) ◽  
pp. 4020-4027 ◽  
Author(s):  
Adrian Hetzer ◽  
Christopher J. Daughney ◽  
Hugh W. Morgan
Keyword(s):  
Metal Ion ◽  
Functional Group ◽  
Thermophilic Bacteria ◽  
Toxicity Tests ◽  
Ion Adsorption ◽  
Geobacillus Stearothermophilus ◽  
Cadmium Ion ◽  
Thermophilic Microorganisms ◽  
Gram Positive Bacteria ◽  
Metal Ion Adsorption

ABSTRACT This study reports surface complexation models (SCMs) for quantifying metal ion adsorption by thermophilic microorganisms. In initial cadmium ion toxicity tests, members of the genus Geobacillus displayed the highest tolerance to CdCl2 (as high as 400 to 3,200 μM). The thermophilic, gram-positive bacteria Geobacillus stearothermophilus and G. thermocatenulatus were selected for further electrophoretic mobility, potentiometric titration, and Cd2+ adsorption experiments to characterize Cd2+ complexation by functional groups within and on the cell wall. Distinct one-site SCMs described the extent of cadmium ion adsorption by both studied Geobacillus sp. strains over a range of pH values and metal/bacteria concentration ratios. The results indicate that a functional group with a deprotonation constant pK value of approximately 3.8 accounts for 66% and 80% of all titratable sites for G. thermocatenulatus and G. stearothermophilus, respectively, and is dominant in Cd2+ adsorption reactions. The results suggest a different type of functional group may be involved in cadmium biosorption for both thermophilic strains investigated here, compared to previous reports for mesophilic bacteria.

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